Modification of Turbulent Channel Flow by Passive and Additive Devices
Warholic, Michael David
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https://hdl.handle.net/2142/82446
Description
Title
Modification of Turbulent Channel Flow by Passive and Additive Devices
Author(s)
Warholic, Michael David
Issue Date
1997
Doctoral Committee Chair(s)
Hanratty, Thomas J.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
Solutions of surfactants in water can be formulated so that rod-shaped micelles are created, which can reduce the drag over what would be experienced with a Newtonian fluid flowing turbulently at the same rate. A solution of 2000 ppm tallow-(tris-hydroxyethyl)-ammonium acetate (or Ethoquad T/13/50) and sodium salicylate is investigated in this study. The instantaneous streamwise and normal velocity fluctuations were measured using LDV for four different Reynolds numbers; $Re\sb{b}$ = 13300, 19100, 3200, and 49100. For a fixed volumetric flow the pressure drop is reduced by 62 to 76 per cent when compared to a Newtonian flow with an equal wall viscosity. Measurements were made of the mean streamwise velocity, the root-mean-square of the streamwise and normal fluctuating velocities, the Reynolds shear stress, and the spectral density function of the fluctuating velocity in the streamwise direction. (Abstract shortened by UMI.).
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